Peres José A S, de Carvalho Luís H Melo, Boaventura Rui A R, Costa Carlos A V
Centro de Química, Departamento de Química, Universidade de Trás-os-Montes e Alto Douro, Vila Real, Portugal.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2004;39(11-12):2897-913.
The objective of this work was to investigate the oxidation of p-hydroxybenzoic acid by the Fenton's reagent. Batch experiments were carried out to investigate the influence of the most important process variables: hydrogen peroxide and ferrous salt concentrations, pH, and temperature. The optimal results obtained indicate that p-hydroxybenzoic acid can be effectively degraded using Fenton's oxidation within 10-min reaction time by using a molar ratio H2O2: p-hydroxybenzoic acid of 4:1 and H2O2:Fe2+ of 15:1, at 30 degrees C and pH=3.0. The behavior of ORP and pH along the reaction time for different values of R (molar ratio H2O2: p-hydroxybenzoic acid) was also discussed. A pseudo-first order model was applied to describe the oxidation kinetics of p-hydroxybenzoic acid by Fenton's reagent.
本研究的目的是探究芬顿试剂对对羟基苯甲酸的氧化作用。进行了批次实验，以研究最重要的工艺变量的影响：过氧化氢和亚铁盐浓度、pH值和温度。所获得的最佳结果表明，在30℃和pH = 3.0的条件下，使用摩尔比H2O2:对羟基苯甲酸为4:1以及H2O2:Fe2+为15:1时，对羟基苯甲酸可在10分钟的反应时间内通过芬顿氧化法有效降解。还讨论了不同R值（H2O2:对羟基苯甲酸的摩尔比）下氧化还原电位（ORP）和pH值随反应时间的变化情况。应用伪一级模型来描述芬顿试剂对对羟基苯甲酸的氧化动力学。
